diff options
Diffstat (limited to 'src/lib.rs')
-rw-r--r-- | src/lib.rs | 14 |
1 files changed, 13 insertions, 1 deletions
@@ -85,6 +85,8 @@ mod error; /// [`Backend`]: trait.Backend.html pub mod backends; +use std::env; + pub use crate::error::{Error, Result}; /// A dialog box that can be shown using a backend. @@ -335,9 +337,19 @@ impl DialogBox for Question { /// Creates a new instance of the default backend. /// -/// The current implementation always returns a [`Dialog`][] instance. +/// The following steps are performed to determine the default backend: +/// - If the `DIALOG` environment variable is set to a valid backend name, this backend is used. +/// A valid backend name is the name of a struct in the `backends` module implementing the +/// `Backend` trait in any case. +/// - Otherwise, a [`Dialog`][] instance is returned. /// /// [`Dialog`]: backends/struct.Dialog.html pub fn default_backend() -> Box<dyn backends::Backend> { + if let Ok(backend) = env::var("DIALOG") { + if let Some(backend) = backends::from_str(&backend) { + return backend; + } + } + Box::new(backends::Dialog::new()) } |